You need to let us know what the exact database error is in order for us to help. Just view the page source and it's on the bottom. Here it is:
Code:
<!--
Database error in vBulletin :
mysql_connect() [<a href='function.mysql-connect'>function.mysql-connect</a>]: Access denied for user 'A90009644'@'localhost' (using password: YES)
/home/a9009644/public_html/upload/includes/class_core.php on line 311
MySQL Error :
Error Number :
Request Date : Saturday, June 13th 2009 @ 01:47:43 PM
Error Date : Saturday, June 13th 2009 @ 01:47:43 PM
Script : http://projectbobba.com/upload/
Referrer : http://projectbobba.com/
IP Address : xxxx
Username :
Classname : vB_Database
MySQL Version :
-->
It sounds like either you don't have the correct username/password set up for your database, or you didn't give that username the correct permissions for the database.
Edit: Brooks beat me to it!